Perturbed square ring slot antenna with reconfigurable polarization

Abstract

A reconfigurable polarization antenna includes a microwave dielectric substrate having a ground plane that has a centrally located slot with five conducting patches, four of which form an evenly spaced apart perimeter group with a gap between each and the fifth, centrally positioned conducting patch. A conducting pad is positioned in each gap and is connected via a switch to the ground plane. A microstrip feed line including a short stub is positioned on the opposite side of the substrate and electromagnetically coupled to the slot. The polarization of the antenna is reconfigured by a selection of an on or off state of each of said switches.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This Application claims the benefit of U.S. Provisional Application 61 / 060,289 filed on Jun. 10, 2008.BACKGROUND OF THE INVENTION[0002]The invention is directed to an antenna with reconfigurable polarization, and more particularly, to an antenna having a perturbed square ring slot configuration for operating in multiple polarizations.[0003]Circular polarized (CP) antennas are popular choices in mobile wireless communications applications owing to their ability to allow flexible orientation between the transmitter and receiver antennas and to reduce multipath effects that can lead to signal fading, e.g. as described in S. H. Hsu and K. Chang, “A Novel Reconfigurable Microstrip Antenna with Switchable Circular Polarization”, IEEE Antennas and Wireless Propagation Let., Vol. 6, 2007, pp. 160-162; Y. J. Sung, T. U. Jang, and Y. S. Kim, “A Reconfigurable Microstrip Antenna for Switchable Polarization”, IEEE Microwave & Wireless Components Let....

AI Technical Summary

Benefits of technology

This patent is about a new type of antenna that can work in different ways to improve wireless communication. It is designed using a very simple and cost-effective process, and can be easily printed on a special substrate. The antenna uses special components called PIN diodes, which can be controlled to change the shape of the antenna and improve its performance. With this design, the antenna can work in different modes, which allows for better communication in various situations. Overall, this new design is a useful addition to the field of wireless communication.

Problems solved by technology

This technique has the drawbacks of requiring two feed lines as well as a hybrid network of some kind to provide the necessary phase shift.

Yang describes a microstrip antenna with polarization diversity, but their design is limited in switching between LHCP and RHCP, with no operation possible in LP.

However, this design requires a polarizing screen to achieve CP, introducing an extra layer of complexity.

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